Note the word order here.

Googling “slip over midi” gives a lot of fashion blogging about mini dresses and slips that one wears under them, so I’m not quite sure what you mean.

But if you mean “midi over slip”, then that is the inverse case from what I am suggesting. Midi over slip (and slip could be any tcpip substrate, such as ethernet) has midi messages as the payload, carried via tcpip.

I’m talking about using midi messages to carry tcpip payloads. You can absolutely do it, but it isn’t really what the protocol is designed for.